Can you provide any details about Gajanan Maharaj from the introductory chapter?

Based on the provided source material, there are no references to Gajanan Maharaj. The introduction, specifically the excerpts from Chapter 0, focuses entirely on the figure who would come to be known as Sai Baba. This chapter describes his first appearance to Chandbhai Patil in a forest, where he miraculously helps find a lost horse and creates fire from the ground. The text then follows him as he travels with a wedding procession to Shirdi, where he meets Mhalasapati in the Khandoba temple and is given the name 'Sai Baba'. The narrative is centered on his arrival and naming, not any other saints.